Test Doubles — Stubs, Spies, and Mocks

Liar named: a comment above assert len(spy.calls) &gt;= 0 \nexplains why it always passes (the assertion is structurally\ntrivial — len of any list is non-negative). The Liar stays in\nthe file as a cautionary example , not a test that gets fixed.
Goldilocks read: assert spy.calls == [(\"u1\", 100)] pins\nexactly what the spec mandates — one call with two arguments.
Faded filled in: 5 days × 10 gold = 50 (under the 100-gold\ncap). The strong oracle pins the exact 2-tuple.
Generation: days=12 → the cap clamps to 100. You wired\nup the spy/service yourself — same shape as the worked\nexamples, but every line was your decision.

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Reading aloud 1.0x